Some notes :

- still need to change these changes with other compilers (MSVC / clang...)

- had to add a -Wno-invalid-offsetof for GCC (still need to test w/ other compilers) : apparently gcc 4.4 is somewhat incorrect in tagging our templated class as POD.

- had to change fvarData.h to initialize bitfields to 0 as gcc generates truncated int warnings when trying to initialize 31 bits to -1

- in mesh.h replaced original tbb::concurrent_vector with std::vector until a better solution can be found

Fixes #93